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There are three taps fitted in a tank. A can fill up the tank in 60 min and B can fill the tank in 75 min, while C empties the tank in 100 min. If the three taps work together, in how much time the taps will be able to fill the tank?1. 30 min2. 25 min3. 60 min4. 50 min |
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Answer» Correct Answer - Option 4 : 50 min Given: A can fill up the tank in 60 min B can fill the tank in 75 min C empties the tank in 100 min Concept used: Work = time × efficiency Calculation:
Efficiency of C = -3 as it is emptying the pipe. Total efficiency of A, B ,and C together = 5 + 4 - 3 = 6 Time to fill the tank = 300/6 ⇒ 50 mins ∴ Time taken to fill the tank is 50 mins. |
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